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A group of professional detectives challenge Nancy to tackle a mystery that they have failed to solve: find an invaluable message hidden by a missionary centuries ago in a hollow oak tree in Illinois.
1. Indian War Secret
2. Annoying Traveler
3. The Weird Voice
4. Rough Ride
5. Air Spy
6. Ear to the Ground
7. River Pirates
8. Exciting Plans
9. Escaping Thief
10. Disappearances
11. Problem in Jealousy
12. Rewarding Search
13. Alarming Moments
14. Bess's Scheme
15. Strange Row of Stones
16. Fakers
17. Unexpected Plunge
18. Well-House Clue
19. Surprise!
20. Kit and Caboodle
This is book 12 in the Nancy Drew Mystery Stories series.
List the books that contain additional information about this book.
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